The Government could also ask for an extension to Article 50 – which would have to be agreed by the remaining 27 members of the bloc – either from the current Government or in the instance that a new Prime Minister was appointed either following a vote of no confidence or should Mrs May resign.

Should the EU not agree to a postponing of Brexit then the UK would leave the EU without a deal on March 29. Any incoming Prime Minister could also agree that the UK would be best served by trading on World Trade Organisation terms.

The big unknown is if the EU agrees to an extension of Article 50 and there is the potential for negotiations to be reopened.

This Plan B could include discussion about a free trade agreement, customs union, membership of the single market and even a second referendum on the deal.